voltage drop
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=108651
Printed Date: April 28, 2024 at 7:04 PM
Topic: voltage drop
Posted By: sublinux
Subject: voltage drop
Date Posted: November 03, 2008 at 10:11 PM
I got a voltage drop when at high volume in my cavalier 98... I got 8 Gague wire for the amp.. (Pioneer GM-7300T) but i dont know if the problem is the alternator or the wire.. because i have changed my wire - Added one Battery to engine. (Before was Engine to chassis) Battery to chassi and alternator wire are OEM. The positive battery cable is a 8 gauge and ground to chassi 8 gauge too... What i really need to do ?
Replies:
Posted By: ragsports
Date Posted: November 03, 2008 at 10:29 PM
Is the pioneer the only amp you are running? chances are you are exceeding your the capibilities of you electrical system. We need more information before we can tell you exactly what to do, but chances are you will need to upgrade your alternator, adding another battery does nuthing if you cant replace the power being drawn.. Is the current alternator a stock alt? Also what fusesd are in the amp, i cant seem to find any specifications on model stated there is a ssimilar model GM-7300M, let me know..
Posted By: sublinux
Date Posted: November 04, 2008 at 12:41 AM
Sorry, i am running GM-D7400M Class D ( https://www.pioneerelectronics.com/PUSA/Products/CarAudioVideo/Amplifiers/GMSeries/GM-D7400M) My alternator its stock. There is 2x 25A Fuse on the amp. I got a 1.0 Farad Cap too..
Posted By: sublinux
Date Posted: November 04, 2008 at 12:43 AM
Its the only amp running in the car. Its wired to a Clarion SRW1051 subwoofer in 4 Ohms in a ported box.
Posted By: i am an idiot
Date Posted: November 04, 2008 at 2:11 AM
Is there a voltage drop to the amp, or is there a voltage drop at your headlights when the bass is hitting?
Upgrade the battery to chassis wire.
Posted By: sublinux
Date Posted: November 05, 2008 at 1:15 AM
Well here the update... i have changed the ground wire from battery to chassis ... now its a gauge 4.. Its better than before .. example my headlight doesnt flash now but when i turn the heater and more accessories there still voltage drop.. the voltage drop evrywhere in the car.
Posted By: ragsports
Date Posted: November 05, 2008 at 8:16 PM
you are getting a bigger voltage drop when all the accessories in the car are running because they to draw alot of power. If you want to completly stop voltage drop you need to upgrade your big 3 as well as upgrade your alternator...
Posted By: i am an idiot
Date Posted: November 05, 2008 at 8:33 PM
Were you having these problems before you upgraded the wiring?
Posted By: sublinux
Date Posted: November 05, 2008 at 11:28 PM
Well the only wire that have not been changed is the alternator positive to battery positive and its the hardest one because its hided and wired to a fuse block . And the voltage drop its on the battery and on the amp. Example a big boom at high volume can drop voltage to 9 Volt in 1 second (While the car is running).
Posted By: i am an idiot
Date Posted: November 06, 2008 at 1:15 AM
i am an idiot wrote:
Were you having these problems before you upgraded the wiring?
Were you having these problems before you upgraded the wiring?
Posted By: i am an idiot
Date Posted: November 06, 2008 at 1:43 AM
Do you have access to a Digital Volt Meter?
Posted By: sublinux
Date Posted: November 06, 2008 at 11:55 AM
Yes
Posted By: i am an idiot
Date Posted: November 06, 2008 at 1:09 PM
i am an idiot wrote:
i am an idiot wrote:
Were you having these problems before you upgraded the wiring?
Were you having these problems before you upgraded the wiring?
Posted By: sublinux
Date Posted: November 07, 2008 at 12:23 AM
Well before it was on the battery and amp..
Posted By: joselmartinez
Date Posted: November 07, 2008 at 9:19 AM
sublinux wrote:
Well the only wire that have not been changed is the alternator positive to battery positive and its the hardest one because its hided and wired to a fuse block . And the voltage drop its on the battery and on the amp. Example a big boom at high volume can drop voltage to 9 Volt in 1 second (While the car is running).
then leave this as it is and run another like a 4g or a0g from alternator to bat., make sure it's not fused or you will have the same problems.
Posted By: sublinux
Date Posted: November 07, 2008 at 10:50 PM
Are you sure of that?
Posted By: sublinux
Date Posted: November 08, 2008 at 5:32 PM
Wire without fuse its safe?
Posted By: Mad Scientists
Date Posted: November 09, 2008 at 3:48 PM
Put a fuse in the wire.. Jim
Posted By: sublinux
Date Posted: November 09, 2008 at 9:56 PM
How much for the fuse? 100 A? I got a cavalier 98 With stock alt.
Posted By: ckeeler
Date Posted: November 10, 2008 at 10:39 AM
always fuse power wires. they will not cause the problem you describe.
Posted By: ckeeler
Date Posted: November 10, 2008 at 10:40 AM
joselmartinez wrote:
[then leave this as it is and run another like a 4g or a0g from alternator to bat., make sure it's not fused or you will have the same problems.
bad idea
Posted By: sublinux
Date Posted: November 10, 2008 at 10:23 PM
Bad idea for the wire or wire without fuse?
Posted By: ckeeler
Date Posted: November 11, 2008 at 8:57 AM
wire without fuse=no protection=possible fire or very extensive damage
Posted By: sublinux
Date Posted: November 11, 2008 at 10:04 AM
Ok but how much ampere for a stock alt and battery?
Posted By: ckeeler
Date Posted: November 11, 2008 at 10:27 AM
you need a bigger fuse than the amperage you will pull through it but other than that its just to protrct the wire in case it shorts. use a 150 amp fuse because you wont be able to pull more than that through it with the equipment you have now but will still protect your wire.
Posted By: sublinux
Date Posted: November 11, 2008 at 2:39 PM
New wire installed with 100A Fuse. Big3 updated because before i had installed 4 Gauge to Chassis to ground , engine to chassis. Now the sub doesn't cut.
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